Luminescence of α-Al2O3 and α-AlOOH natural mixtures

García-Guinea, Javier; Rubio, Juan; Correcher, V.; Valle-Fuentes, F. J.

doi:10.1016/s1350-4487(01)00078-6

Cited by 30 publications

(16 citation statements)

References 11 publications

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“…2a and Supplementary Fig. 10b), being ascribed, in the literature, to the presence of surface defects 26,27,35,37 .…”

Section: Resultsmentioning

confidence: 77%

“…Luminescent metal oxide nanoparticles may offer a possible alternative to meet the material demand for ultraviolet-pumped WLED, mainly because of their high stability, simplicity, low toxicity and low cost. The fluorescence properties of Al 2 O 3 or g-AlOOH (boehmite) nanoparticles have already been studied [26][27][28][29][30][31][32][33][34][35][36][37][38] . For instance, these nanoparticles present emission in the ultraviolet and blue spectral regions due to lattice anion vacancies (F and F þ centres or grouping of these two defects) [30][31][32][33][34][35][36][37][38] excited through absorption of anionic vacancies below 300 nm, mismatching the pumped wavelength (350-420 nm) of commercial ultraviolet chips [26][27][28][29][30][31][32][33][34][35][36][37][38] .…”

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confidence: 99%

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Efficient and tuneable photoluminescent boehmite hybrid nanoplates lacking metal activator centres for single-phase white LEDs

et al. 2014

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White light-emitting diodes (WLEDs) are candidates to revolutionize the lighting industry towards energy efficient and environmental friendly lighting and displays. The current challenges in WLEDs encompass high luminous efficiency, chromatic stability, high colourrending index and price competitiveness. Recently, the development of efficient and low-cost downconverting photoluminescent phosphors for ultraviolet/blue to white light conversion was highly investigated. Here we report a simple route to design high-efficient WLEDs by combining a commercial ultraviolet LED chip (InGaAsN, 390 nm) and boehmite (g-AlOOH) hybrid nanoplates. Unusually high quantum yields (Z yield ¼ 38-58%) result from a synergic energy transfer between the boehmite-related states and the triplet states of the benzoate ligands bound to the surface of the nanoplates. The nanoplates with Z yield ¼ 38% are able to emit white light with Commission International de l'Eclairage coordinates, colour-rendering index and correlated colour temperature values of (0.32, 0.33), 85.5 and 6,111 K, respectively; overwhelming state-of-the-art single-phase ultraviolet-pumped WLEDs phosphors.

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“…2a and Supplementary Fig. 10b), being ascribed, in the literature, to the presence of surface defects 26,27,35,37 .…”

Section: Resultsmentioning

confidence: 77%

mentioning

confidence: 99%

Efficient and tuneable photoluminescent boehmite hybrid nanoplates lacking metal activator centres for single-phase white LEDs

et al. 2014

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“…It can be applied in the field of optics, fusion reactors as an insulator and for optical window [1,2]. The optical properties of this material can be modified by point and extended defects, created due to different type of particle irradiation [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence study of swift heavy ion (SHI) induced defect centers in sapphire

Jheeta

Jain

Kumar

et al. 2006

Journal of Nuclear Materials

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“…As observed in natural diaspore, the high-temperature maximum peaking at 177°C can be linked to a discrete trap structure (Garcia-Guinea et al 2001b, 2005. This peak has also been detected in Al 2 O 3 : C that is usually employed for the estimation of environmental doses (Guissi et al 1999;Yukihara et al 2003) and in natural diaspore (Correcher et al 2003b).…”

Section: Thermally Stimulated Luminescencementioning

confidence: 64%

“…The low intensity broad structure over 200-220°C suggests a continuous trap distribution system as described in diaspore by Garcia-Guinea et al (2001b, 2005. It should correspond to de-hydroxylation mechanisms and chromophore oxidation that could help to explain the high temperature UV-blue emissions mainly due to the presence of leucite, sillimanite and mullite (figure 2).…”

Section: Thermally Stimulated Luminescencementioning

confidence: 95%

Study of aluminium oxide from high-alumina refractory ceramics by thermoluminescence

et al. 2008

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This work is focused on the study of the thermally stimulated blue emission of aluminium oxide (Al 2 O 3 ) that has been removed from twenty different high alumina-rich refractory bricks. The glow curve sensitivity of several alumina grains are defined by (i) a maximum centred at about 165°C that can be deconvoluted into two first order kinetic peaks at 157 and 177°C and (ii) a broad structure over 200-220°C that suggests a continuous trap distribution system. The isolated grains, analysed by means of X-ray diffraction, are composed of 43% of alumina (Al 2 O 3 ), 22% of mullite [72% of Al 2 O 3 and 28% of SiO 2 ], 12% of leucite (KAlSi 2 O 6 ) and 23% of sillimanite [Al 2 O 3 ⋅SiO 2 ]. The sample characterization has been performed using X-ray fluorescence and scanning electron microscopy.

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Luminescence of α-Al2O3 and α-AlOOH natural mixtures

Cited by 30 publications

References 11 publications

Efficient and tuneable photoluminescent boehmite hybrid nanoplates lacking metal activator centres for single-phase white LEDs

Efficient and tuneable photoluminescent boehmite hybrid nanoplates lacking metal activator centres for single-phase white LEDs

Photoluminescence study of swift heavy ion (SHI) induced defect centers in sapphire

Study of aluminium oxide from high-alumina refractory ceramics by thermoluminescence

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